452 
as the indusia are persistent after the sporangia have burst out all 
around the edges of them, it forms a very pretty and unusual sight. 
On the upper side of the pinnae the moon-shaped veins are quite 
plainly to be seen similar to the veins of the genus Meniscoum and 
these give the fern its specific name. : Neither Hooker’s Species. 
Filicum nor the Synopsis Filicum ‘mentions the crowded state of 
the mature sori which gives this fern such a remarkable appear- 
ance; but Grisebach,'in his Flora of the British West — 
notes it as one of the characteristic features. 
The genus Antrophyum contains 18 acknowledged species, of 
which only six, or just one-third, are inhabitants of the western 
hemisphere. The species of this genus present quite as good an! 
example as those of Acvostichum of the changes that may be rung 
on a simple fronded fern without cutting of any kind. to break it 
up into separate sections. The forms are created by differences 
in breadth and width, by long or short stipes, by blunt. or.acute 
apices, and by possessing or not a distinct midrib. Two species 
are distinctly characterized by the last-named feature. The com- 
moner one is Antrophyum Cayennense Kaulf., which grows in Cuba 
as well as on the continent. The other 4. subsessile Kze., is 
much less abundant, and this is the one which Dr. Rusby’s col- 
lection contains. As its name implies, its fronds are almost, and 
sometimes quite sessile, whereas A. Cayennense has a stipe from 1 
to 3 in. long. Another feature is that while the veizs are reticu- 
lated as in all the species of this genus, the sori follow the oblique 
forkings of the veins, but seldom the reticulations. It is an inter- 
esting species for study. I might go on and speak of other at- 
tractive ferns:in this collection, but the ones already mentioned 
are the most important and infrequent, while the others are liable 
to be found in almost any series coming from the American trop-. 
ics. Enough has been said, however, to show that this collection 
contains more good things than would ordinarily ve found in << 
a limited number of species. 
The following is a complete list of the ferns of this collection: 
Hemitelia grandifolia Spr. Rocky banks in deep forest along 
Eleanor Creek (110). 
Flemitelia Guianensis Parkeri Hook. soey soil along creek, 
Manoa (384). , 
